Pipe-elbow-bending machine.



n WM.

J.DYM0Nn PIPE ELBOW BENDING MACHINE.

APPLICATION FILED MAY 16, 1913.

1,096,025,` Patented May 112, 1914.

6 SHEETS-SHEET 1.

58M 1- .le o

CII

ATTORNEY.

J. DYMOND.

PIPE ELBDW BENDING MAGHIlU.`

APPLIOATION FILED MAY 1s, 191s.

e SHEETS-SHEET z.

A TT ORNE Y.

J. DYMOND.

PIPE ELBOW BBNDING MACHINE.

APPLICATION FILED MAY 16, 1913. l

Patented May 12, 1914.

6 SHEETS-SHEET 3.

WTNESSES: l INVENTOR.

M; W. j

A TTORNK J. DYMOND.

PIPE ELBOW BBNDING MACHINE.

APPLICATION FILED MAY 16| 1913. y 1,096,025, Patented May12, 1914.

6 SHEETS-SHEET 4.

Mwsses.

J. DYMOND.

PIPE ELBOW BBNDING MACHINE.

APPLICATION FILED MAY 16i 1913.

Patnted May 12, 1 914.

6 SHEETS-SHEET 5.

. .I il

i i gg my QI.

A ToR/VEY.

J. DYMON D.

HPB ELBOW BBNDING MAGHINB.

APPLICATION FILED MAY 16I 1913. 1,096,025, Patented May 12, 1914.

6 SHEETS-SHEET 6.

1 Figli UNiTED STATES PATENT oFFioE.

JOHN DYMOND, OF TORONTO, ONTARIO, CANADA, ASSIGNOR 0F ONE-FIFTH TOJOI-IN DOUGLAS, OIFv VANCOUVER, BRITISH COLUMBIA, CANADA, ANDTHREE-TENTHS TO LOUISA E. l'W`ESL"ON, CARRYING ON BUSINESS UNDER STYLEOF W'ESTON & CO., OF TORONTO, ONTARIO, CANADA.

THE FIRM-NAME AND PIPE-ELBOW-BENDING MACHINE Specification of LettersPatent.

Application led Mey 16, 1913. Serial No. 768,042. f

To all whom it may concern.'

Be it known t at I, JoHp DrivioND, of the city of `Toronto,in theProvince of Ontario, Canada, have invented certain vnew and usefulImprovements in Pipe-Elbow- Bending fMachines, of which the following isa specification.

This invention relates to machines for bending elbows for sheet metalpipes such as used in downlow pipes for eavestroughing in .which theinterior must be comparatively smooth and my object is to devise amachine for this class of Work which will be sim le, strong and durableand which will prouce substantially a perfect elbow.

I attain my object by means ofthe constructions hereinafter describedand illustrated inthe accompanying drawings in whioh- Figure Al is afrontelevation of my iinproved machine;l Fig. 2 is -a side elevation ofthe same; Fig. 3 is-a longitudinal section with parts (bro-ken away;Fig. 4 is an elevation partly in section showing the inner side of thefhead of the machine; Fig. 5 is an enlarged sectional detailillustrating the crimping of 'the pipe; Fig. 6 is a'side elevationpartly in section Aof the pipe elbow as formed bymy-machine; Fig. 7 is afront v elevation, partly insection, ofthe feedei' head; Fig. 8 is arear .elevation of the saine; Fig-.9 is aplan-'view of part of the saine.showing particularly the clamping levers;

Fig. 10-:is `apl-an view showing the means for :th-rowingY the .clutchof .the machine out of engagement at--the .completion of an elbow; Fig.11 `isa rear end elevation of part of the machine showing-the aforesaidclutch actuating means.;- Fig. 12 is: a-sectional detail showing. :themethod of carrying the folder rin-g; Fig. 13 is a front elevation of thecrimper knife adjustment.

In the drawings like :numerals of reference indicate corresponding partsin the dif.- ferent :fi lires.` v

1 is t e frameof the maohinesuitably shaped to support the differentarts. O11 this frame is suitablyjournaled t e shaft 2, from Which'themovable parts of themachine are driven. This shaft is driven from theshaft byeineans of the pinion 4 lon the Shaft 13 meshing with the gearAwheel 5 loose on. the shaft 2 and adapted to be given a drivingconnection therewithby means of the clutch 6, which may be of anysuitable construction actuated in the ordinary manvided at its underside with the ratchet rack` Patented May 12, 1914.

10, with which engages the dog 11, which is v vertically slidable in theslide 12,-movable longitudinally in the guides 13 (see Fig. 3). Thisslide is actuated by means of theroclr arm 105 pivoted at 14,intermediate its ends to the bracket 15, secured tothe bed of the'machine. The upper end df the arm engages the slide by means of a pinand slot-connection to compensate for the angular movement of the rockarm, and the arm is provided at its lower end with an anti-frictionroller 16 adapted to engage in the grooved cam 17 suitably figured toproduce the desired rocking movement bf the rock-arm. The dog 11 isnormally yieldingly pressed upward y by means of the spring 18. By thelmechanism described the dog is linterniittently reciprocatedlongitudinally of the machine, feeding forward the rack one tooth at atime and slipping back to rengage in a new position.

The feeder head 8 is rovided with the `:following means for hol ing andclamping the lengths of pipe. A sleeve 19 is supported longitudinally ofthe machine, being connected at the rear of the 'machine to the rea-rhead 20 and its forward end supported in the `feeder head 8, which isslidable longitudinally on the sleeve, asI well as on the guides 9. Acollar 21 is formed at the front of the feeder head and with this collarthe clamp arms 22 are adapted to coperate. These clamp arms are pivotedat their lower ends on a common pivot, 23, and their sides are so shapedthat when their upper ends are brought together they will securely clampa length of pipe against the collar 21. Their upper ends are actuatedfor this purpose by the levers 24, pivoted intermediate their lends andengaging the upper ends of the said clamp arms (as shown parfolder rinoto hold down the crimped tion.

ticularly in Figs. 7, 8 and 9). The other ends of these levers 24 areadapted to be spread by means of the wedge 25, which is formed on theslide 2G, vertically movable on the guide 27 extending upwardly from thefeeder head. Secured to this guide is the upwardly extending screwed thehand wheel 106, the hubof which isl provided with a flange 30 engagedwith the notched fingers 31 secured to the slide 20. It is evident thatby rotating the hand wheel 106 that the wedge 25 may be actuated to rockthe levers 24 to actuate the clamp arms 22and that by a reverse movementof the hand wheel the clamp arms may be released.

The operation of the machine demands that a central mandrelbe employedto support the pipe and to carry and actuate a ortions of the pipe ashereinafter deseri ed. This mandrel 32/is slidable within the sleeve 19and extends through the rear end of the rear head 20. This mandrel isreciprocated by means of the rocking lever 33 connected with the mandrelby means of the pin and slot connection 34. This rocking levei may beactuated in any suitable manner from the cam shaft 2. I show for .thispurpose a rocking lever 35 having its lower end provided withanti-friction rollers 36 adapted to be engaged by the opposed cams 37secured to the shaft`2. This rocking lever 35 is connected with therocking lever 33 by means of the pivoted link 38. At the forward end themandrel is provided with an enlargement 107 adapted to closely fitwithin the pipe (see particularly Figs. 3 and 5). Spaced from the endlof the mandrel is a folder ring 39, the function of which is to folddown the crimps formed yin the pipe, as indicated in Figs. 5 and 6. Toenable the folder ring to accommodate itself .to slight irregularitiesin the crimps I preferably give it freedom to rock slightly in anydirection. For this purpose I connect it with the mandrel, preferably asfollows: A. disk with a segmental spherical projection 40 is fitted onthe end of the mandrel and the folder ring l30 is suitably shaped to fitthis projec- The outer side of the folder ring is also provided with asimilar segmental spherical projection 41, concentric with the former. Ascrew 42 is formed at the end of the mandrel and the folder ring fitsloosely thereon. (See Fig. 12.) -A nut 43 is screwed on the screw 42loutside the folder ring and is preferably concaved to receive thesegmental spherical projection 41, and a second or outer nut is alsopreferably provided to jam the former. By suitably adjusting the nutsthe folder ring will beproperly held in position while it is free torock slightly in' any direction as desired.

The operation of the machine, as so far screw 28, on which isydescribed, is as follows: lVith the parts in the position shown in Fig.5 a crimp is formed in the pipe through means hereinafter described, thecrimped metal being` forced into the space between the folder ring andthe enlargement 107. The inandrel is then retracted and the folder' ringdraws down and fiattens out the crimps, as indicated in Fig. G. As thecrimps progressively decrease in depth from the throat to the back ofthe pipe, the latter assumes the curved elbow form as desired. The pipeis suitably held, crimped and released to permit of the operation of themandrel by the following means: At the front end of themachine aclamping head o1' frame is provided having a central opening fortheipassagevof the lengths of pipe. This i head is formed in two parts,44 and 45, snitably guided in the vertical guides 46. The. divisionbetween the two parts is horizontal and intersects the center of theopening therein. :During the crimping operation the clamping head andthe end of the mandrel are in substantial alinement` as shown in Fig. 5.The opening is preferably provided with a special steel clamping ringalso formed in halves and adapted to be removed for renewal or repairs.This clamping ring 47 is preferably divided horizontallyl and the halvesare fitted to a holder 48 by a suitable arrangement of grooves andprojections, as shownin Fig. The holder is similarly provided and fittedto the parts of the clamping head. lt will be noted on reference to Fig.4 that the clamping ring 47 is eccentric to the enlargement 107 so thatmore space for clearance is provided at the throat of the elbow wherethe folds of metal require more room than the Single thickness at theback.

To actuate the clamping head I provide the following mechanism: On thecam shaft 2 is located an eccentric 49 connected with a cross head 50,connected with the connecting rods 51, passing through lugs 114 securedto the upper part 44 of the clamping head. A collar 115 secured on eachconnecting rod engages below the lug 114 and thus provides a connectionwhereby the. lpart 115 44 of the head may be lifted. .Nuts 116 arescrewed on the ends of the connecting rods and are so spaced above theupper ends of the lugs 114 that as the connecting rods descend, the nutsonly en- 120 gage the lugs just at the end of their downward movement.Except just at this time there is, therefore, no positive clampingaction of the clampinghead except as hereinafter described. This part ofthehead is 1.25

.as hereinbefore described a ngact-ion is maintained on the pipe beingon suitable fulcrums 117 on the bed of the machine, and pivotallyconnected with the lower ends of vertical rods 54 which extend upwardlyto a suitable position to be engaged by the projecting portions of theupper part of the head 44. Adjusting screws 55 are preferably providedat the upper ends of the rods 54, so that ithe movements of the lowerpart 45 of the head may be accurately regu-lated to synchronize withthat of the upper part. Instead of or in addition to the screws 55 I maymake vthe fulcrum 117 adjustable to and' from the projection. 52. Forthis purpose I employ a 'right-and-left hand threaded screw 118 providedat its center with a collar 119 by means of which it may be rotated. Thescrew is threaded into the fulcrums and -the collar held from endwisemovement by being fitted into ya notch 120 formed in a part of the frameof the machine. It will be evident that by turning lthe collar the-fulcrums may be adjusted as desired. I also provide spring meanstending to hold the upper part of the clamping head in its clampingposition. For this purpose I provide pins 56 projecting upwardly fromthe guides 46 and havingv suitable nuts screwed on their upper ends.Coil springs 57 sur-V rounding the pins engage the nuts and the upperside of the upper part 44 of the.

clamping head.- Thus except when the upper part 44 of the clamping headis lifted yielding clampbent except just as the crimping, hereinafterdescribed, is being completed when the clamping is made positive ashereinbefore v described. During folding the clamping action is yieldingwhichprevents the folding ring from breaking or tearing the pipe bycatching on imperfectionsor roughnesses. The-mechanism is so timed thatthe parts ofthe head are brought together to clam-p the ipe on theenlargement 107 on the endv of tie mandrel 32 duringlthe crimpingoperation, and to release the pipe after the folding operation, duringwhich the mandrel end has to travel rearwardly within the 1 e. p l.Thecrimping is done by means of four crimper knives which are arranged atthe front of the machine so as to move radially substantially on thediagonals of an imaginary square circumscribing the pipe and having oneside tangential to the back-ofv the pipe. The lower knives are movable4on suitable guides 58 carried on the end' of they machine. Theselowerknives comprise the backs 59 and the blades 60, which are separatedby a wedge-shaped space in which a wedge 6] is adapted to reciprocate.`This wedge is adjustable by means. of a screw 62 engaging suitable lugson the back 59 of the knife and on the wedge and actuable in the lknives.

ordinary manner to adjust the position of the wedge. This enables me toaccurately adjust the position of the edges of each of the lower knives.The upper knives l,68 are movable on the lower knives preferably bybeing pivoted thereto. In the drawings I show each upper knife providedwith an arm 67 pivoted at 69 on one of the lower Each of4 the u perknives/.is provided with the inclined) upper surface 70, adapted toengage a projection 71"'on the end v of the machine. Each projection 71is preferably formed as an anti-friction roller, which for the purposesof adjustment is' carried on the plate 72, formed as a leverl of thefirst order, suitably fulcrumed on the frame ofthe machine and providedwith the clamp nut and slot adjustment 73, whereby the plates may beadjusted tovarythe positions ofi the projection 71 relative to theinclined surfaces 70. The 'result of this conlso struction is that asthe lower knives are raised the inclined surfaces 70, by theirengagement with the projections 71, force the upper knives inwardly atthe same time.

'Ihese movements are so correlated that each of the four lmives movesinwardly on a substantially radial line. The operative edges of theknives, it will be seen onireference to Fig. l, form substantially acomplete circle,

Abut this circle is eccentric to the. axis of the mandrel 32, so that acrimpl is formed which is deepest at the throat of the pipe and diesaway to nothing at the back thereof. To insure the proper crimping ofthe throat-it is preferable that the lower blades slightly overlap, asshown.

Coil springs 74 secured to the upper knives and to the. end of themachine -serve to retract the upper knives as the lower knives arewithdrawn through the action of the eccentric 63. 'It will be noted thatfor convenience in replacement the crimpingblades 75 are made removable,being secured in place by means of the screws 76. Theeccentric 63 is sotimed that the crimping operation takes 'place during the time that theclamping head is clamping the pipe on the end of the mandrel 32.

The clutch is manually controlled by m'eans of the lever 7 7 pivoted ata convenientpointat the front of the machine. This lever, by means ofthe connectin rod 78, actuates the transverse rock shaft 9, whichilsprovided with a suitable crank arm v to which the connecting rod ispivoted. This rock shaft has a second rock arm 81 securedthereto,'connected by meansof a connectingoted intermediate lts ends tothe frameof' the machine and adapted to actuate thev shifter lever 7bymeans of the connecting rod 84'. When the machine is to be s'top readyfor the removal of a finished elbow itV is desirable to automaticallythrow out-the roo Arod 82 to one end of a rocking lever 83, pivl I llasped-

Vieu

B having operative connections with the clutch dog- 11. For this purposeI provide on the rock shaft 79 arock arm 85, which is provided with apin or other projection 86 adapted to engage a nger 87 projecting fromthe lower end -of the stem of the dog 11. When the rock shaft isactuated in the operation of throwing out the clutch the pin engages thelinger and draws the dog down out of engagement with the rack. As soonas the clutch is thrown in again the finger is, of course, released andthe dog rises to its original position. See Fig, 3. s

To enable the machine to automatically throw out the clutch as soon asan elbow is completed, thus stopping itself, I provide the followingmechanism: A lever 88 is fulcrumed with its upper end just behind therear end of the mandrel 32. A contact screw 89 provided with clampingnuts is screwed through the end ofthe lever and serves to adjust .thegap between thelever and the mandrel. The lower'end 90 of this lever is-bent laterally to engage one end of a lever 91 fulcrumed intermediateits ends. The other end of -this lever is pivot-ally connected with alooped link '94 hooking about a rock arm 92 -secured to a crank disk 93pivoted on the side of the machine. 'A connecting rod-95 is pivotallyconnected with a wrist pin on thedisk and also with the arm 80 vashereinbefore described. Ordinarily'v as the mandrel reciprocates it deesnottouch the contact screw 89 but it is evident that if.

.a part be moved between the two the rearward movement of the mandrelmay be'used to throw out the clutch. For this purpose I provide theblock 96' on the arm 97 swung onthe. upper end of the lever 98 fulcrumedintermediate its ends. The lower end of this lever has an anti-'frictionroller 99 journaled thereon. This roller lies in the path ofthe inclinedplane 100' carried on one arm of the bell-cranklever 101. The other armof the lever 101 is connected by the link 102 .with one arm of thebellcrank lever 103, the

other end of which lies in the path of a pin 104 at the rear end of therack 10. The lastforward movement of the rack thus operates the lever103 to movethe block 96 betweenf the end ofthe mandrel 32 and thecontact screw 89 and the last rearward movement of the mandrel as itfolds the last crimp throwsthe clutch out of gear through theconnections already described,

As the dog 11 is automatically thrown out at the same time as'the clutch6, IV find it necessary to provide means to prevent the head 8 beingprematurely pushed back when released by the dog 11. For this purpose Iprovide the latch 108.pivoted on the head and adapted to automaticallyengage the catch 109 on the frame of the machine. Thelatch is providedwith .a tail 110 engageable by the pivoted lever 111.l This lever isoperable by the connecting rod 112 from the foot lever 113 which thusprovides means whereby the operator can conveniently release the headwhen the machine comes to rest and the elbow is removed. It is alsodesirable to provide means for adjustably determining the rearwardposition of the feeder head so that when shifted back it will come tothe same position every time without special attention on the operatorspart. For this purpose I rovide the screw stop 121 screwed through helug 122 on the frame-of the machine. A lug 123 is formed on or securedto the feeder head S in a position to engage the screw stop 121. Thisstop is set according tothe length of the pipes to be bent so that aftereach elbow is completed it is merely necessary to push back the feederhead till it is stopped `by the screw That I claim as my invention is 1.In a pipe elbow `m'achinethe combination of a movable feeder head; meansfor intermittently moving the same; means for clamping a length of pipethereto; a longi tudinally movable mandrel' sup orted and proportionedto tit closely within a length of pipe when the latter isqlamped to thehead; a frame having an opening therein through which said length ofpipe may pass;

means for reciprocating the mandrel to v bring it into or out ofcoperative relationship with the frame; a folder ring connected with theend of the mandrel by means of a ball and socket joint whereby it mayrock freely in any direct-ion'a-nd separated from said mandrel end by agroove; radially movable crimper knives; and-means formoving saidknivesto crimp the wall of the pipe into the space between the mandrel andfolder ring.

In a pipe elbow machine the combina tion of a movable feeder head; meansfor intermittently moving the same; means for clamping a length of pipethereto; a longitudinally movable mandrel supported and proportioned tofit closely within a length of pipe when the latter is clamped to thehead; a frame having an openingtherein through which said length of pipemay pass; means for reciprocating Athe mandrel to bring it into or outof cooperative relationship with the frame; a folder ring connected withthe end of the mandrel and separated therefrom by a groove; radiallymo-vable crimper knives; means for moving said knives to crimp the wallof the pipe into the space between the mandrel and the folder 1 ring; ashaft adapted to drive and time the various actuating means; drivingmeans for the shaft; a clutch for putting the shaft into and out of gearwith the driving'means;A l

means normally inoperative whereby the reciprocatlon of the mandrel maythrowpthe 4clutch out of gear; and means actuatedby :which said lengthof pipe may pass, said frame being divided substantially on a planeintersecting the center of said opening;

means. for reciprocating the mandrel to bring it into or out ofcoperative relationship with the frame; meansfor spreading andcontracting the parts of the frame to closely embrace the pipe on themandrel or to release the same; spring means tending to move the partsof the frame to embrace the pipe;a folder ring connected with the end ofthe mandrel and separated therefrom by a groove.; radially movablecrimper knives; and means for moving said knives to crimp the wall ofthe pipe into the space between the mandrel and folder ring.

4. Ina pipe elbow`v machine the combination of a movable feeder head;means for intermittently moving the same; means for clamping a length ofpipe thereto; a longitudinally movable mandrel suitably supported andhaving an end proportioned to lit closely within .a length of pipe whenthe latter is clamped to the head; a frame having an opening thereinthrough which 'said length lof pipe may pass, said frame being dividedsubstantial y on aplane intersecting the center of said opening; meansfor reciprocating the mandrel to bring it intoor out of coperativerelationship with the frame; means for moving each ofthe. parts of theframe to embrace or release the pipe on the mandrel; a folder ringconnected with thev end of the mandrel and separated therefrom by agroove; movable crimper knives; and means for moving the said knives tocrimp the wall of the .pipe into the space between the mandrel and thelfolder ring, the opening'in the frame when the parts are closed toembrace the pipe being eccentric to lthe .space at the throat of thefolder ring and mandrelend to give more pipe than at the back 5. In apipe elbow machine the combina? t-ion of a movable feeder head; meansfor intermittently moving the same; means for clamping a length of pipethereto; a longitudinally movable mandrel supported and proportioned tofit closely withm alength of pipe Vwhen the latter is clampedto thehead;

a frame having an opening therein through which said length ofv pipe maypass; `means for reciprocating the mandrel 'to bring it into or out ofcooperative relationship with the frame; a folder ring connected withthe end of the- .mandrel and separated therefrom by' a groove; radiallymovable crimper knives; means for moving said knives; to crimp the wallof the pipe into the tween the mandrel and the folderv ring; a

'shaft adapted to drive and time 'the'various actuating means; drivingmeans for the shaft; a clutch for pufting the shaft into and out of gearwith the driving means; means normally inoperative whereby thereciprocation of the mandrel may throw the clutch out of gear; and meansactuated by the feeder head adapted to condition the clutch shiftingmeans for operation by the mandrel when the feeder'head reaches itsspace be-f limit of forward movement; and means for ldisengaging themeans for moving 'the feeder head by the action of shifting mechanism. i

6. In a pipe elbow machine the combina- .tion of a movablefeeder head#means for intermittently moving the saule; means `for clamping a lengthof pipe thereto; a -longithe clutch tudinally movable' mandrel'supported and; proportioned to lit closely within a length of whichsaid length of pipe may pass; means for reciprocating the `andrel tobring it pipe when the latter is clamped to the head; f1? a frame havingan opening therein through 95.

into or out of cooperative relationshipwith the frame; a folder ringconnected with the end of the/mandrel and separated therefrom .l by agroove; radially f movable crimper knives; means for moving said knivesto crimp the wall of the pipe into the space b`e tween fthe mandrel andthe folder ring; a shaft adapted to drive and time the various actuatingmeans: driving means for the shaft: a clutch for putting the shaft' intoand out of gear with -the driving. means;

means normally inoperative whereby the reciprocation of the mandrel maythrow theclutchout of gear; and means actuated by the feeder "headadapted to .condition the clutch shifting means for operation by the,mandrel when the feeder head reaches its limit of forward movement;means-.fordisengaging the means for moving the feeder head by the actionof the clutch shifting mechanismaands-a latch-vadaptedto mitop maticallylock the feeder head agamstback-v l ward motion when the feeder hea-dreaches its limit of forwardmovement.

. JOI-IN Signed in the presence .of-

CAMPBELL; L. CHEswnIGH'r.

DYiioNDl I f 12o Dated at lToronto this 3rd day, May p l ion

